﻿Vol. 
  53.] 
  ROCKS 
  AND 
  FOSSILS 
  FROM 
  FRANZ 
  JOSEF 
  LAND. 
  517 
  

  

  associated. 
  The 
  magnetite 
  cannot 
  be 
  distinguished 
  from 
  the 
  inter- 
  

   stitial 
  matter 
  in 
  the 
  figure. 
  [F. 
  318.] 
  

  

  Fig. 
  2. 
  Amygdaloidal 
  basalt 
  from 
  the 
  talus, 
  Cape 
  Flora. 
  X 
  10. 
  Labradorite, 
  

   augite, 
  palagonite, 
  and 
  calcite. 
  In 
  this 
  case 
  no 
  magnetite 
  can 
  be 
  

   recognized 
  under 
  the 
  microscope 
  ; 
  the 
  whole 
  of 
  the 
  iron-oxide 
  appears 
  

   to 
  have 
  remained 
  undifferentiated. 
  The 
  interstitial 
  matter 
  occurs 
  also 
  

   as 
  the 
  infilling 
  material 
  of 
  an 
  irregular 
  cavity, 
  the 
  centre 
  of 
  which 
  is 
  

   occupied 
  by 
  calcite. 
  [F. 
  321.] 
  

  

  Fig. 
  3. 
  Olivine-basalt 
  with 
  chrome-diopside. 
  X 
  10. 
  From 
  the 
  under-surface 
  of 
  

   an 
  iceberg 
  off 
  Eira 
  Cottage. 
  The 
  chrome-diopside 
  occurs 
  as 
  a 
  pheno- 
  

   cryst 
  with 
  a 
  zone 
  of 
  inclusions 
  near 
  the 
  margin. 
  The 
  large 
  black 
  

   inclusion 
  is 
  of 
  a 
  greenish 
  undetermined 
  substance 
  — 
  not 
  magnetite. 
  

   Olivine 
  is 
  not 
  seen 
  in 
  the 
  figure. 
  [F. 
  324.] 
  

  

  Fig. 
  4. 
  Another 
  portion 
  of 
  the 
  same 
  section. 
  X 
  20. 
  The 
  interstitial 
  matter 
  

   in 
  this 
  rock 
  has 
  been 
  devitrified 
  during 
  consolidation, 
  and 
  is 
  crowded 
  

   ■with 
  grains 
  and 
  skeleton-crystals 
  of 
  magnetite, 
  which 
  can 
  be 
  recognized 
  

   in 
  the 
  figure. 
  [F. 
  324.] 
  

  

  Fig. 
  5. 
  Quartz-bearing 
  basalt. 
  X 
  50. 
  From 
  the 
  under-surface 
  of 
  an 
  iceberg, 
  

   found 
  tilted 
  up 
  in 
  De 
  Bruyne 
  Sound. 
  Calcite 
  surrounded 
  by 
  a 
  zone 
  of 
  

   augite-microlites. 
  The 
  clear 
  patch 
  near 
  the 
  outer 
  margin 
  of 
  the 
  zone 
  

   is 
  also 
  formed 
  of 
  calcite. 
  The 
  main 
  mass 
  of 
  the 
  rock 
  is 
  formed 
  of 
  

   microlites 
  of 
  felspar, 
  augite, 
  and 
  magnetite. 
  [F. 
  343.] 
  

  

  Fig. 
  6. 
  Phosphatic 
  nodule 
  from 
  Windy 
  Gully, 
  Cape 
  Flora, 
  x 
  16. 
  [F. 
  336.] 
  

  

  [The 
  numbers 
  in 
  square 
  brackets 
  refer 
  to 
  the 
  collection 
  in 
  the 
  Museum 
  

   of 
  Practical 
  Geology.] 
  

  

  Plate 
  XXXVIII. 
  

  

  Fossil 
  plants 
  from 
  the 
  north 
  side 
  of 
  Cape 
  Flora, 
  Northbrook 
  Island, 
  

   Franz 
  Josef 
  Land, 
  700 
  feet 
  above 
  the 
  sea. 
  

  

  Fig. 
  1. 
  Ginkgo 
  polaris? 
  

  

  3. 
  „ 
  sp. 
  

  

  4. 
  ,, 
  siberica 
  ? 
  

  

  5. 
  

  

  6, 
  7 
  & 
  8. 
  Pine-seeds. 
  

  

  9. 
  „ 
  cone. 
  

  

  10. 
  Baiera? 
  

  

  11. 
  Fieldenial 
  

  

  12. 
  Podozamites 
  ? 
  

  

  13 
  & 
  14. 
  Thyrsopteris 
  sp. 
  

  

  Plate 
  XXXIX. 
  

  

  Figs. 
  2, 
  3, 
  5, 
  7, 
  8 
  & 
  15 
  are 
  of 
  specimens 
  from 
  the 
  watercourse 
  in 
  the 
  talus 
  

   at 
  the 
  back 
  of 
  Elmwocd, 
  Northbrook 
  Island, 
  No. 
  5 
  being 
  found 
  in 
  situ. 
  

   Figs. 
  4, 
  6, 
  10, 
  11, 
  12, 
  13 
  & 
  14 
  are 
  of 
  specimens 
  from 
  the 
  western 
  end 
  

   of 
  Cape 
  Flora. 
  Figs. 
  1 
  & 
  9 
  from 
  Cape 
  Flora. 
  

  

  Figs. 
  1 
  & 
  2. 
  Ammonites 
  (Macrocephalites) 
  macrocejphalus. 
  

   3. 
  „ 
  „ 
  „ 
  var. 
  

  

  4 
  & 
  6. 
  Ammonites 
  {Cadoceras) 
  Tchefkinil 
  

  

  5. 
  ,, 
  „ 
  „ 
  Found 
  in 
  place 
  50 
  feet 
  below 
  the 
  basalt. 
  

  

  7, 
  8 
  & 
  9. 
  Ammonites 
  {Cadoceras) 
  modiolaris. 
  

  

  10. 
  ,, 
  „ 
  „ 
  flattened 
  variety. 
  

  

  11, 
  12 
  & 
  13. 
  Belemnites 
  Vanderi. 
  

  

  14. 
  ,, 
  ,, 
  Piece 
  of 
  large 
  specimen. 
  

  

  15. 
  Gorgonia 
  ? 
  

  

  